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erc20.go
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erc20.go
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// Copyright 2018 Shift Devices AG
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package erc20
import "github.com/ethereum/go-ethereum/common"
// Token holds infos about the erc20 token needed to fetch balances, format amounts, etc.
type Token struct {
contractAddress common.Address
decimals uint
}
// NewToken creates a new Token instance.
func NewToken(contractAddress string, decimals uint) *Token {
if !common.IsHexAddress(contractAddress) {
panic("invalid erc20 contract address")
}
return &Token{
contractAddress: common.HexToAddress(contractAddress),
decimals: decimals,
}
}
// ContractAddress returns the address where the erc20 token is deployed.
func (token *Token) ContractAddress() common.Address {
return token.contractAddress
}
// Decimals returns the number of decimals needed to convert between the smallest unit and the
// standard unit.
func (token *Token) Decimals() uint {
return token.decimals
}